Submission #1085654

#	Time	Username	Problem	Language	Result	Execution time	Memory
1085654		juicy	Palindromic Partitions (CEOI17_palindromic)	C++17	100 / 100	27 ms	20660 KiB

palindromic

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

using ull = unsigned long long;

const int N = 1e6 + 5, B = 331;

ull pw[N];

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  pw[0] = 1;
  for (int i = 1; i < N; ++i) {
    pw[i] = pw[i - 1] * B;
  }  
  int t; cin >> t;
  while (t--) {
    string s; cin >> s;
    int n = s.size(), res = 0, l, r, len;
    ull a = 0, b = 0;
    for (l = 0, r = n - 1, len = 0; l < r; ++l, --r) {
      a = a * B + s[l] - 'a' + 1;
      b = (s[r] - 'a' + 1) * pw[len] + b;
      if (a == b) {
        a = b = len = 0;
        res += 2;
      } else {
        ++len;
      }
    }
    cout << res + (n & 1 || len) << "\n";
  }
  return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 40 / 40